"We simply do not make fun at the expense of other cultures, especially those with a history of being marginalized. When we do this, progress takes a step backward," he said. "Sign Language is important to me because it's the bedrock of Deaf culture."

DiMarco said that Foxx's actions "made our struggle that much harder."

Matlin also took to Twitter to call Foxx out, writing that she'd happily give him sign language lessons so he "could be funnier."